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Fig. 3


Top: 28SiO/29SiO, middle: 28SiO/30SiO, and bottom: 29SiO/30SiO isotopic ratio channel maps. The clean beam of 3.8′′ × 2.8′′ is shown in the bottom left corner of the maps, and the primary beam of 56′′ is reported as a dotted black circle. The contours show the 10, 60, and 120σ levels of the integrated intensity map of 28SiO, shown in Fig. 1. The solar isotopic ratio of [28Si/29Si] = 19.7, [28 Si/30Si] = 29.8, and [29 Si/30Si] = 1.5, including a 5% error, is reported as a dotted box in the colour bar (Anders & Grevesse 1989).

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